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BXTEENAL CHAEACTEES AND HABITS      77
death. Their basal parts are thick and fixed, but their peripheral parts are thinner and slightly mobile. They are composed of fat and connective tissue, and the skin which covers them is naked; Poppig described a specimen in which the skin of the pads was hairy, but no other author has described such a condition. Their occurrence is independent of the age of the animal, and they are found in both the Bornean and Sumatran forms.
FIG. 15.—Adult Orang-Outan.
The hand is long and narrow, and. traces of the primitive pads are only found on the terminal phalanges. The thenar and hypothenar eminences are small or absent. The digits have the same relative lengths as in the Gibbons, but the thumb is diminutive ; all digits are provided with flat nails. The palm is glabrous and pigmented. The flexure lines, which are shown in